WGU Statistics exam with correct answe
u u u u u
rs 2024
u
Inuaustandardu52-
cardudeck,uwhereueachucarduisuassigneduaunumericuvalue,utheumeanuofutheu52ucardsuisu7.0uwith
uaustandardudeviationuof u3.742.uToutestuif uaurepresentativeusampleucanubeuattained,utheudeckuisu
shuffleduandu13ucardsuareurandomlyudrawn,uoneuatuautime.uEachucarduisurecordeduanduthenuretu
rnedurandomlyutoutheudeckubeforeutheunextucarduisudrawn.uThisuprocessuofudrawingu13urandomu
cardsuisurepeateduautotaluofu20utimes,uandutheumeanuandustandardudeviationuofueachurounduisuc
omputed.u
u
Whichutypeuofusamplinguisuthisuanuexampleuof?
Randomizationu
Multipleucomparisonu
Matchedupairsu
Bootstrapu-ucorrectuansweruBootstrap
Austudyuisudoneutoudetermineuifutheucoloruofuanuappleuaffectsutheupurchaseurateubyuconsumersua
tuaugroceryustore.uPurchaseucountsuforuthreeucolorsuofuapplesuareucollected.u
Whichutechniqueushouldubeuusedutoudetermineuifuthereuisuaudifferenceuinupurchaseurateubyucolor
?
Rank-basedu
Randomizationu
t-testu
ANOVAu-ucorrectuansweruANOVA
Auhospitalunetworkucollectsutheuamountuofutimeuitutakesudoctorsutouseeupatients.u
,WGU Statistics exam with correct answe
u u u u u
rs 2024
u
Whichutwoutechniquesuareuappropriateutoucompareutheumeanutimesuofutwousubsetsuwithinuthisus
etuofudoctors?u
Chooseu2uanswersu
u
ANOVAu
t-testu
Logisticuregressionu
Principalucomponentuanalysisu-ucorrectuansweruANOVA
t-test
Audatauanalystuneedsutoudetermineuwhetheruantioxidantsuinublackberriesucanureduceuage-
relateducognitiveudecline.uTwenty-
fiveuadultsubetweenu65uandu80uareuselectedutoueatublackberriesuforusixumonthsuandubeuretested
.uTheuoriginaluscoresuareucompareduwithutheuseconduscoresutoudetermineuwhetheruthereuwasud
ecline.u
Whatuisutheuappropriateumodelutoutestutheuhypothesis?
zutestu
ANOVAu
Linearuregressionu
Two-sampleut-testu-ucorrectuansweruTwo-sampleut-test
WhichuassumptionudoesuaudatauanalystuhaveutoumakeuwhenuperforminguANOVAuonuaudataset?
,WGU Statistics exam with correct answe
u u u u u
rs 2024
u
Thereuareujustutwouparametersuthatuareubeinguestimated.u
Theuerrorutermsufollowuaunormaluprobabilityudistribution.u
Theuparametersuareuadditive.u
Theuexplanatoryuvariableuisucontinuous.u-
ucorrectuansweruTheuerrorutermsufollowuaunormaluprobabilityudistribution.
Whichutwouassumptionsuareumadeuwhenutheulinearuregressionumodeluisuused?u
Chooseu2uanswersu
u
CriticaluvalueuisubaseduonuFisher'suexactutest.u
Errorutermsuareuindependentuanduidenticallyudistributed.u
Variancesuareunotuequal.u
Parametersuβu0,uβu1,uanduσu2uareuconstant.u-
ucorrectuansweruErrorutermsuareuindependentuanduidenticallyudistributed.
Parametersuβu0,uβu1,uanduσu2uareuconstant.
Whichuassumptionuisurequiredutouperformuautwo-sampleut-test?
Equaluvarianceu
Largeusampleusizeu
Smallusumuofuresidualsu
, WGU Statistics exam with correct answe
u u u u u
rs 2024
u
Equalumeanu-ucorrectuansweruEqualuvariance
Givenutheufollowingustatisticalumodel:u
u
yu=u42u-u4.6ubu
u
u
Matchueachuelementuofutheumodeluwithuitsucorrespondinguterm.u
u
Answeruoptionsumayubeuusedumoreuthanuonceuorunotuatuall.uSelectuyouruanswersufromutheupull-
downulist.u
u
yuDependentuvariableuDependentuvariable
u
42uInterceptuIntercept
u
-4.6uSlopeuSlope
u
buIndependentuvariableuIndependentuvariableu-
u
correctuansweruyuDependentuvariableuDependentuvariable
u
42uInterceptuIntercept
u
-4.6uSlopeuSlope
u
buIndependentuvariableuIndependentuvariable
u
Givenutheufollowingugeneralizedutwo-sampleut-testuequation:u
u
yiu,ju=uµiu+uεiu,ju
u
u
Classifyueachuelementuinutheuequation.u
u u u u u
rs 2024
u
Inuaustandardu52-
cardudeck,uwhereueachucarduisuassigneduaunumericuvalue,utheumeanuofutheu52ucardsuisu7.0uwith
uaustandardudeviationuof u3.742.uToutestuif uaurepresentativeusampleucanubeuattained,utheudeckuisu
shuffleduandu13ucardsuareurandomlyudrawn,uoneuatuautime.uEachucarduisurecordeduanduthenuretu
rnedurandomlyutoutheudeckubeforeutheunextucarduisudrawn.uThisuprocessuofudrawingu13urandomu
cardsuisurepeateduautotaluofu20utimes,uandutheumeanuandustandardudeviationuofueachurounduisuc
omputed.u
u
Whichutypeuofusamplinguisuthisuanuexampleuof?
Randomizationu
Multipleucomparisonu
Matchedupairsu
Bootstrapu-ucorrectuansweruBootstrap
Austudyuisudoneutoudetermineuifutheucoloruofuanuappleuaffectsutheupurchaseurateubyuconsumersua
tuaugroceryustore.uPurchaseucountsuforuthreeucolorsuofuapplesuareucollected.u
Whichutechniqueushouldubeuusedutoudetermineuifuthereuisuaudifferenceuinupurchaseurateubyucolor
?
Rank-basedu
Randomizationu
t-testu
ANOVAu-ucorrectuansweruANOVA
Auhospitalunetworkucollectsutheuamountuofutimeuitutakesudoctorsutouseeupatients.u
,WGU Statistics exam with correct answe
u u u u u
rs 2024
u
Whichutwoutechniquesuareuappropriateutoucompareutheumeanutimesuofutwousubsetsuwithinuthisus
etuofudoctors?u
Chooseu2uanswersu
u
ANOVAu
t-testu
Logisticuregressionu
Principalucomponentuanalysisu-ucorrectuansweruANOVA
t-test
Audatauanalystuneedsutoudetermineuwhetheruantioxidantsuinublackberriesucanureduceuage-
relateducognitiveudecline.uTwenty-
fiveuadultsubetweenu65uandu80uareuselectedutoueatublackberriesuforusixumonthsuandubeuretested
.uTheuoriginaluscoresuareucompareduwithutheuseconduscoresutoudetermineuwhetheruthereuwasud
ecline.u
Whatuisutheuappropriateumodelutoutestutheuhypothesis?
zutestu
ANOVAu
Linearuregressionu
Two-sampleut-testu-ucorrectuansweruTwo-sampleut-test
WhichuassumptionudoesuaudatauanalystuhaveutoumakeuwhenuperforminguANOVAuonuaudataset?
,WGU Statistics exam with correct answe
u u u u u
rs 2024
u
Thereuareujustutwouparametersuthatuareubeinguestimated.u
Theuerrorutermsufollowuaunormaluprobabilityudistribution.u
Theuparametersuareuadditive.u
Theuexplanatoryuvariableuisucontinuous.u-
ucorrectuansweruTheuerrorutermsufollowuaunormaluprobabilityudistribution.
Whichutwouassumptionsuareumadeuwhenutheulinearuregressionumodeluisuused?u
Chooseu2uanswersu
u
CriticaluvalueuisubaseduonuFisher'suexactutest.u
Errorutermsuareuindependentuanduidenticallyudistributed.u
Variancesuareunotuequal.u
Parametersuβu0,uβu1,uanduσu2uareuconstant.u-
ucorrectuansweruErrorutermsuareuindependentuanduidenticallyudistributed.
Parametersuβu0,uβu1,uanduσu2uareuconstant.
Whichuassumptionuisurequiredutouperformuautwo-sampleut-test?
Equaluvarianceu
Largeusampleusizeu
Smallusumuofuresidualsu
, WGU Statistics exam with correct answe
u u u u u
rs 2024
u
Equalumeanu-ucorrectuansweruEqualuvariance
Givenutheufollowingustatisticalumodel:u
u
yu=u42u-u4.6ubu
u
u
Matchueachuelementuofutheumodeluwithuitsucorrespondinguterm.u
u
Answeruoptionsumayubeuusedumoreuthanuonceuorunotuatuall.uSelectuyouruanswersufromutheupull-
downulist.u
u
yuDependentuvariableuDependentuvariable
u
42uInterceptuIntercept
u
-4.6uSlopeuSlope
u
buIndependentuvariableuIndependentuvariableu-
u
correctuansweruyuDependentuvariableuDependentuvariable
u
42uInterceptuIntercept
u
-4.6uSlopeuSlope
u
buIndependentuvariableuIndependentuvariable
u
Givenutheufollowingugeneralizedutwo-sampleut-testuequation:u
u
yiu,ju=uµiu+uεiu,ju
u
u
Classifyueachuelementuinutheuequation.u
